From: chuck23@dejanews.net   
      
   On Tue, 16 Jan 2024 22:28:09 -0500, Usenetist    
   wrote:   
      
   >On 1/9/24 12:24, ohg...@gmail.com wrote:   
   >>   
   >>> Hello! I have read all your posts and you are absolutely right.   
   Unfortunately, there are always such people who qualify the helpers. Well, I   
   also learned a lot from what was written here, at the hobby level I repair a   
   VHS VCR, which also has no color.   
    The type is AKAI VS-3. I repaired the servo part and the power part did not   
   work. Now it starts, plays, spins. The head drum was also bad, so I put in a   
   new original one. Now there is a picture, but it is black and white and jumps   
   a little. I can't    
   adjust the tape path any better. I would really appreciate it if you could   
   advise me. I checked the video pcb, all12, pb12 are fine. Unfortunately, I   
   don't have a test cassette, although I tried to make a color bar cassette and   
   check it at the test    
   points, but I didn't have much success.   
   >>> Thank you in advance for your help.   
   >>   
   >> Those old Akais had lots of electrolytic caps that get weak with age.  Try   
   heating the signal boards with a heat gun to see if the color returns.  If it   
   does, you're going to have to recap that unit if you intend to keep it.   
   >>   
   >   
   >   
   >Can you explain the heat gun technique for bad caps... how does it work?   
   When you heat up a bad cap, the ESR goes down and the capacitance goes   
   up and sometimes the problem goes away. You then replace the cap you   
   were heating when the symptom went away. I would suggest buying a   
   cheap esr meter on EBay. It is a quicker and more certain way of   
   finding bad capacitors.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)